Chevrolet 70 1969 Series, Руководство по ремонту

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C A B A N D BO DY M O U N T IN G S 1-9
IN S T A L L A T IO N (Fig, 5)
1. If transmission shaft was separated from
housing, locate small tension washer on shaft be­
fore inserting shaft into housing,
2. Locate shaft and housing assembly to mount-
irtg bracket and attach housing to bracket with two
screws, nuts, and washers,
3. Locate motor into mounting bracket, then
install connecting link.
IM P O R T A N T : Make sure end of link marked
’“Crank End”
is
connected to motor crank arm.
feta
11
link, retaining rings,
4. Attach motor
to
mounting bracket with three
IM P O R T A N T : Make sure motor ground
strap is sandwiched between motor and bracket.
, d of wiper transmission shaft,
»t washer, flat steel washer, and
............ t retaining ring,
TiOUBLESHOOTING
(TWO-SPEED WIPER)
o figures 8 and 11 when trouble
wiper,
TT??Or'.i, T R O U B L E CO N D IT IO N S
i, Wiper will not shut off,
fi, W«per inoperative,
3,
s one speed (High).
5. ass one t^peed (Low) and shuts off
-•a.irjii : ; - ; v
xc.
"High" position.
Rauk:;.:
00
'
;jot return to "Park” position
m'uk ;■ is
\ "L o w ” speed posi-
;d position.
'■
':'x-‘:ruteh
intermittently.
T A L L E D W IPER
■ . • ! Af
■ ■ operates in both "High"
i 'Low-'"
iMjeeds, " h o w "
speed only, or "High”
v1.’v
•
must operate in "L o w ”
Bpi-irii ihj ri-eg
parking cycle.
wiring harness from wiper
e rating wiper independently of
.s shown in figure 11. If wiper
■•••perates
correctly
independently of the dash switch
with crank arm in "Park"posi-
ble causes below:
a. if wiper operates in both speeds, lead be-
inal No, 1 and dash switch is
,sh switch is defective,
erates in "L o w " speed only, the
terminal No. 3 and dash switch
is grounded, or the dash switch is defective.
c. If wiper operates in "High" speed only, the
lead between wiper terminal and dash switch is
open, or the dash switch is defective.
3. If wiper still fails to operate correctly,
remove it from cab, then remove covering from
over drive gears and check parking switch con­
tacts which may be broken or stuck inclosed posi­
tion; check for a grounded lead at No. 1 or 3 term­
inals (fig. 11), or for a grounded shunt field.
Wiper Inoperative
1. Check wiring harness connections at motor
and at dash switch.
2. Check fuse (if used) or circuit breaker (if
used).
3. See if wiper motor ground strap is secure.
4. Check for loosely mounted dash switch.
5. If wiper still fails to operate, disconnect
wiring from motor, and check for 12 volts at motor
No. 2 terminal (fig. 11). No voltage indicates de­
fective wiring.
6. With harness disconnected from motor, try
operating motor as shown in figure 11. If wiper fails
to operate, remove wiper transmission linkage and
recheck wiper operation. If wiper operates, linkage
is at fault. If wiper does not operate, remove unit
from vehicle for disassembly.
Wiper Has One Speed - Fast
Check for a defective dash switch or open lead
between motor No. 3 terminal and dash switch.
Wiper Has One Speed (Low) and Shuts Off
With Dash Switch in "High” Speed Position
Reverse harness leads that connect to motor
terminals No. 1 and No. 3.
Blades Do Not Return to "Park" Position
When Wiper is Turned Off
1. Check wiper motor groundconnectiontocab.
2. Remove wiper motor from cab and check
for dirty, bent or broken "Park” switch contacts.
Wiper Speed Normal in "L o w "
But Too Fast in "High"
Remove wiper motor from cab and check for
an open terminal board resistor.
Intermittent Operation.
Check for loose wiper ground connection and
or loose dash switch mounting.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L